Shearer Loader Planetary Gearbox Segmented Housing Maintenance
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Solution Overview
Problem
Shearer loaders in longwall mining face challenges in repairing and maintaining planetary gears due to their complex assembly and the need for disassembly of the support arm, leading to cumbersome and time-consuming processes, especially under cramped site conditions, resulting in significant production losses.
Innovation Solution
The introduction of a separate radially projecting fastening flange for the gear housing section adjacent to the support arm, allowing the planetary gear to be detached and repaired separately, along with a multi-wedge composite element for non-rotatable connection, facilitates easier maintenance and transport by enabling the planetary gear to be removed and reattached without disassembling the support arm, using a screw connection with preload nuts for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the planetary gearbox is integrated into the support arm as a single unit, then the structural integrity and torque transmission are improved, but the ease of repair and maintenance deteriorates significantly
Solution Approach 1:
The planetary gearbox housing is divided into multiple axially arranged, ring-shaped housing sections that can be separated from each other. This segmentation allows the gearbox to be disassembled into manageable components for repair while maintaining structural integrity during operation. The housing sections are connected by screw bolts located at their periphery, enabling easy separation and reassembly.
Solution Approach 2:
The planetary gearbox is designed to be extractable as a complete unit from the support arm. The gearbox housing includes a mounting flange that can be detached from the support arm's counter flange, allowing the entire gearbox assembly to be removed and transported for repair without disassembling the support arm structure.
2Ease of repair
If the planetary gearbox housing consists of multiple axially arranged ring-shaped sections, then the ease of assembly and disassembly for repair is improved, but the device complexity increases
Solution Approach 1:
The housing is segmented into axially arranged ring-shaped sections that can be easily assembled and disassembled. Each section is connected to adjacent sections via screw bolts positioned at the periphery, creating a simple yet effective segmentation scheme that reduces repair complexity despite dividing the housing into multiple parts.
3Reliability
If the support arm with attached planetary gearbox is transported for repair, then the repair quality in workshop conditions is improved, but the loss of time and production efficiency deteriorates
Solution Approach 1:
The gearbox housing is segmented into multiple sections that can be separated to reduce the overall size and weight of the assembly during transport. This segmentation makes it feasible to transport the gearbox for workshop repair without requiring the entire support arm, thereby reducing downtime.
Solution Approach 2:
The planetary gearbox is extracted as a complete functional unit from the support arm, allowing it to be transported to workshop conditions for high-quality repair. The extraction design includes a mounting flange connection that enables clean separation while maintaining the gearbox's operational integrity for transport and reinstallation.
4Ease of repair
If separate screw connections are used to fasten the gearbox housing to the support arm, then the ease of detachment for repair is improved, but the device complexity and number of components increases
Solution Approach 1:
The connection between the gearbox housing and support arm is segmented into separate screw connections. The housing includes a mounting flange with peripheral screw holes that align with corresponding holes in the support arm's counter flange, enabling easy detachment through standardized screw fasteners without complex coupling mechanisms.
Data Source
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AI summary
The invention relates to a shearer loader for mined extraction in longwall mining, comprising a machine body (1) that can move along a longwall conveyor (2) in the longitudinal direction of the longwall, and at least one cutting drum (4) which is carried by a carrier arm (3) fixed to the machine body (1) in a pivotable manner, is mounted on the free end of the carrier arm (3) such that it rotates about an axis extending parallel to the roofs and perpendicularly to the face, and can be driven by a drive motor associated with the carrier arm (3) by means of a train of gears arranged inside the carrier arm (3) and a planetary gearbox on the free end of the carrier arm (3), the gearbox housing (5) of which, connected to the end section of the carrier arm (3) in a non-rotatable manner, consists of axially successive annular housing sections ( 5a, 5b, 5c) held together by screwed bolts (6) on the periphery thereof. In order to be able to detach the gearbox housing (5) and the planetary gearbox contained therein as a whole from the carrier arm (3), in such a shearer loader, the housing section (5c) of the gearbox housing (5), adjacent to the carrier arm (3), comprises a separate attachment flange (7) which can be fixed to a complementary mating flange (10) on the free end of the carrier arm (3), by means of a separate screw connection (8, 9).